Inspired by Tantek Çelik, I’ve given up caffeine. Now, because I don’t drink coffee, this primarily involves the absence of sugar-free cola-flavoured beverages. On a typical day I’ll go through about two or more litres of the stuff (yes, really), but I haven’t had any since Thursday. Friday was filled with the expected caffeine-deprivation headache, but today was okay. It’s too early to comment on specific physical effects, but I’m going to keep this up until at least the end of the week and see what happens. If any of the effects Tantek described manifest themselves, it might be worth staying off it.